<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .qwe{
        width: 100%;
        height: 500px;
        background-color: orangered;
    }
    .asd{
        width: 100%;
        height: 500px;
        background-color: orangered;
    }
    .zxc{
        
    }
</style>

<body>
    <div class="qwe">
        <div class="asd"></div>
        <div class="zxc"></div>
    </div>
</body>
</html>